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Título: | Molecular-scale shear response of the organic semiconductor β -DBDCS (100) surface |
Autor: | Álvarez Asensio, María Isabel; Moreno-Ramírez, Jorge S.; Pimentel, Carlos CSIC ORCID CVN ; Casado, Santiago; Matta, Micaela; Gierschner, Johannes; Muccioli, Luca; Yoon, Seong-Jun; Varghese, Shinto; Park, Soo Young; Gnecco, Enrico; Pina, Carlos M. CSIC ORCID | Fecha de publicación: | 13-sep-2017 | Editor: | American Physical Society | Citación: | Physical Review - Section B - Condensed Matter 96(11): 115422 (2017) | Resumen: | In this work we present friction-force microscopy (FFM) lattice-resolved images acquired on the (100) facet of the semiconductor organic oligomer ( 2 Z , 2 ′ Z ) − 3 , 3 ′ -(1,4-phenylene)bis(2-(4-butoxyphenyl)acrylonitrile) ( β -DBDCS) crystal in water at room temperature. Stick-slip contrast, lateral contact stiffness, and friction forces are found to depend strongly on the sliding direction due to the anisotropic packing of the molecular chains forming the crystal surface along the [010] and [001] directions. The anisotropy also causes the maximum value of the normal force applicable before wearing to increase by a factor of 3 when the scan is performed along the [001] direction on the (100) face. Altogether, our results contribute to achieving a better understanding of the molecular origin of friction anisotropy on soft crystalline surfaces, which has been often hypothesized but rarely investigated in the literature. | Versión del editor: | https://doi.org/10.1103/PhysRevB.96.115422 | URI: | http://hdl.handle.net/10261/185547 | DOI: | 10.1103/PhysRevB.96.115422 | ISSN: | 2469-9950 | E-ISSN: | 2469-9969 |
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Molecular-scale shear response_AlvarezAsencio.pdf | 2,07 MB | Adobe PDF | Visualizar/Abrir |
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